Showing posts with label REDOX TITRATION:. Show all posts
Showing posts with label REDOX TITRATION:. Show all posts
Thursday, August 3, 2023
Friday, April 24, 2020
A 1.0 g impure sample containing [Zn(NH3)4CI2] and some inert impurity was treated with 16 ml of 1.0 M NaOH solution, where all the complex was converted into [Na2Zn(OH)4]. Ammonia formed is first boiled off and then the excess of base required 4 ml of 1.0 M HCI solution for complete neutralisation. After the neutralisation the solution is reacted with excess of AgNO3 solution. the mass of AgCI produced (in mg) is x. The value of x10 is.
Give your Answer........
Calculate the millimoles of SeO3(2−) in solution on the basis of following data: 70 ml of 60/M solution of KBrO3 was added to SeO3(2−) solution. The bromine evolved was removed by boiling and excess of KBrO3 was back titrated with 12.5 mL of 25/Msolution of NaAsO2. The reactions are given below. I. SeO3(2−) +BrO3(−) + H+→SeO42−+Br2+H2O II. BrO3(−) +AsO2(−) + H2O→Br(−) +AsO4(3−)+ H+
SOLUTION:
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Friday, January 31, 2020
50 Cm3 of 0.04 M K2Cr2O7 in acidic medium oxidized a sample of H2S gas to Sulphur . The volume of 0.03 M KMnO4 required to Oxidize the same amount of H2S gas to Sulphur, in acidic medium is.
50ml of KMnO4 is mixed with excess of KI the I2 liberated require 30 ml of 0.1M Na2S2O3 solution calculate the Molarity of KMnO4 solution
829 gm of K2Cr2O7 and H2C2O4 reacts completely with 7/3 moles of K2Cr2O7 . (1) Calculate the moles of each in mixture. (2) Calculate the moles of NaOH required to react with above mixture.
696 gm of Fe2O3 and FeO reacts completely with 158 gm of KMnO4 in acidic medium . Calculate the composition of mixture.
Calculate the Molarity of H2O2 if 11.2 ml H2O2 require 30 ml of 0.5 M K2Cr2O7 for its Oxidation . also calculate the volume of strength of H2O2.
Calculate volume of 0.05 M KMnO4 required to react with 50 ml of 0.1M H2S in acidic medium , given H2S oxidized to SO2?.
Calculate the moles of KMnO4 required to reacting with 180 gm of Oxalic acid (H2C2O4). Also calculate the volume of CO2 at STP produce in the reaction? (K=39, Mn=55, Of=16)
Tuesday, January 29, 2019
REDOX TITRATIONS:
LAW OF EQUIVALENT WEIGHT:
No of equivalent of A reacted = No of equivalent of B
reacted = No of equivalent of C formed = No of equivalent of D formed
RELATION BETWEEN NORMALITY (N) AND MOLARITY (M):
SOME COMMON OXIDISING AGENT:
SOME COMMON REDUCING AGENT:
ILLUSTRATIVE EXAMPLE (1): Calculate the moles
of KMnO4 required to reacting with 180 gm of Oxalic acid (H2C2O4).
Also calculate the volume of CO2 at STP produce in the reaction? (K=39, Mn=55,
Of=16)
SOLUTION:
ILLUSTRATIVE EXAMPLE (2): Calculate the weight of K2Cr2O7
which reacts with KI to liberate 254 gm of I2 ?.(Cr=51.9961, I=127)
SOLUTION:
ILLUSTRATIVE EXAMPLE (3): Calculate volume of 0.05 M KMnO4 required to
react with 50 ml of 0.1M H2S in acidic medium , given H2S
oxidized to SO2?.
SOLUTION:
ILLUSTRATIVE EXAMPLE (4): Calculate the mass of Fe3O4 required
to react completely with 25 ml of 0.3 M K2Cr2O7?.
SOLUTION:
ILLUSTRATIVE EXAMPLE (5): Calculate the concentration of H2O2 if
20 ml H2O2 Solution react with 10 ml of 2M KMnO4
in acidic medium ?
SOLUTION:
ILLUSTRATIVE EXAMPLE (6): Calculate the moles of KCl which required to produce 10 ml
of Cl2 when reacted with KClO3 ?
SOLUTION:
ILLUSTRATIVE
EXAMPLE (7): Calculate the moles of KMnO4 required for
Oxidation of 1.25 moles Cu2S.
SOLUTION:
ILLUSTRATIVE
EXAMPLE (8): Calculate the Molarity of H2O2 if 11.2
ml H2O2 require 30 ml of 0.5 M K2Cr2O7
for its Oxidation . also calculate the volume of strength of H2O2.
SOLUTION:
ILLUSTRATIVE
EXAMPLE (9): 696 gm of Fe2O3 and FeO reacts
completely with 158 gm of KMnO4 in acidic medium . Calculate the
composition of mixture.
SOLUTION:
ILLUSTRATIVE
EXAMPLE (10): 829 gm of K2Cr2O7 and H2C2O4
reacts completely with 7/3 moles of K2Cr2O7
.
(1) Calculate the moles of each in mixture.
(2) Calculate the moles of NaOH required to react with above mixture.
(1) Calculate the moles of each in mixture.
(2) Calculate the moles of NaOH required to react with above mixture.
SOLUTION:
ILLUSTRATIVE
EXAMPLE (11): 50ml of KMnO4 is mixed with excess of KI the I2
liberated require 30 ml of 0.1M Na2S2O3
solution calculate the Molarity of KMnO4 solution.
SOLUTION:
ILLUSTRATIVE
EXAMPLE (12): 50 Cm3 of 0.04 M K2Cr2O7
in acidic medium oxidized a sample of H2S gas to Sulphur . The
volume of 0.03 M KMnO4 required to Oxidize the same amount of H2S
gas to Sulphur, in acidic medium is.
SOLUTION:
ILLUSTRATIVE
EXAMPLE (13): What volume of 0.4 M Na2S2O3
would be required to react with the I2 liberated by adding excess of
KI to 50 ml of 0.2 M CuSO4? (Ans= 25 ml).
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